I’m frustrated

'UP' button missing on EUROTHERM 2116 SSP Auto. Temp. Control

We have a THERMOLYNE F21130-33 tube furnace where the 'UP' button on the EUROTHERM 2116 SSP Automatic Temperature Control has completely broken off and is now missing. I can actually see the circuitry on the PCB behind where the rubber button normally sits.
Is it possible to buy and fit in a replacement button? Everything else appears to be working okay, so I do not really want to buy a complete 2116 fitting.
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